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EARTHQUAKE RESPONSE OF BRIDGE PIERS ON PILE FOUNDATIONS

THIS STUDY WAS MADE IN AN ATTEMPT TO CLARIFY THE EARTHQUAKE-RESPONSE CHARACTERISTICS OF BRIDGE PIERS RESTING ON DEEP PILE FOUNDATIONS. A SINGLE PIER WAS REDUCED TO A VIBRATION MODEL WITH A SINGLE DEGREE OF FREEDOM WHICH IS TO BE EXCITED THROUGH N PLUS 1 HORIZONTAL SPRINGS REPRESENTING THE ELASTICITY OF THE GROUND BY EARTHQUAKE MOTIONS VARYING WITH DEPTH 0, 1, 2, TO N. THE GROUND MOTION AT THESE LEVELS WAS CALCULATED WITH THE AID OF THE THEORY OF PROPAGATION OF PLANE SHEAR WAVES IN ELASTIC OR VISCOELASTIC LAYERED MEDIA. /AUTHOR/